Oak Creek is a city in the U.S. state of Wisconsin. Located in Milwaukee County, it sits on the southwestern shore of Lake Michigan and is located immediately south of Milwaukee. The city is one of the fastest growing in Milwaukee County and all of Wisconsin. As of the 2020 census, the population was 36,497. The area has experienced an economic boom in recent years, with the addition of large companies such as Amazon, IKEA, and the Astronautics Corporation of America.